Add ostruct as a development dependency

Author: orien

stack_master.gemspec

@@ -33,6 +33,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "cucumber"
   spec.add_development_dependency "aruba"
   spec.add_development_dependency "timecop"
+  spec.add_development_dependency "ostruct"
   spec.add_dependency "os"
   spec.add_dependency "ruby-progressbar"
   spec.add_dependency "commander", ">= 4.6.0", "< 6"